I've been using them in the California sun for two weeks and they work great. Cut out the sun but I can still see through it. I have a large SUV and the front ones fit well. The back is a bit big for the window, but better too big than too small. I also use them when my car is parked to keep the temperature down. You can slide them aside like a curtain when you don't need full coverage or when you're just passing through. Check out some of my photos. I had these with suction cups a few years ago and they are much better because of the magnets. While you can wind down the window with them I wouldn't ride them like that as I think the drafts would be too strong for the magnets to hold unless the widows are just a tiny bit open. I found it negative that the magnets are not sewn on. I would also like some more magnets on the ends.
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